Device for varying the speed of machinery



(No Model.) 2 Sheets-Sheet l.

G. M. CONRADSON.

DEVICE FOR VARYING THE SPEED OF MACHINERY.

No. 460,284. Patented Sept. 29, 1891.

dilornqy (Nd Model.) 2 Sheets-Sheet 2.

O. M. GONRADSON. DEVICE FOR VARYING THE SPEED OF MACHINERY.

No. 460,284. Patented Sept. 29, 1891..

@IIIHIIWIMIHIHJE will"? s v n UNITED STATES PATENT OEEIcE.

CONRAD M. OONRADSON, OF MADISON, XVISOONSIN.

DEVICE FOR VARYING THE SPEED OF MACHINERY.

SPECIFICATION forming part of Letters Patent No. 460,284, datedSeptember 29, 1891. Application filed January 6, 1891. Serial No.376,836. (No model.)

To all whom it may concern:

Be it known that I, CONRAD M. CONRADSON, a citizen of the United States,and a resident of Madison, in the county of Dane and State ofWVisconsin, have invented certain newand useful Improvements in Devicesfor Varying the Speed of Machinery; and Ido hereby declare that thefollowing is a full, clear, and exact description of the invention,whichwill enable others skilled in the art to which it appertains to make anduse the same, reference being had to the accompanying drawings, whichform a part of this specification.

The object of my invention is to provide means for quickly varying thespeed of machinery through a large range of speed and in an efficientand practical manner. The ordinary face-Wheel and friction-roller are incommon use; but no large amount of power can be transmitted by thismeans, as the friction is excessive. The range of speed is also limited.My invention obviates this difficulty in the manner set forth in thefollowing specification.

In the accompanying drawings, Figure 1 shows a side elevation of thedevice, Fig. 2 an epd elevation of the device, and Fig. 3 the p an.

The brackets B B, attached to base A, carry shafts J and K, either oneof which may be the driving-shaft. On the shafts J and K are mounteddisks E and D. The arms M M, which are supported on the shaft N, carryjournals 0 C, supporting the friction-rollers F and G, which bear onopposite sides of the disks O and D. The shaft Nis adjustable to anydesired point longitudinally by means of an arm or lever R, as is usualin this class of devices, thus varying the acting radii of the disks Dand E. Secured to one of the arms M is an outWardly-projeoting rod 0,which passes through the other arm. The outer end of this rod isprovided with a nut or head P. A coiled spring L embraces this rod, oneend of which bears against one of the arms, while the other end abutsagainst the nut or head P, whereby the friction-rollers F G, carried bysaid arms, are pressed against the disks 0 D.

The disks D and E, and also the rollers F and G, may be of any suitablematerial.

The journal-bearings O O are not rigidly connected with the arms M M,but are at tached by means of a pin-joint, so as to be free to oscillateslightly, thus allowingeach roller to bear on the disks D and E withequal pressure. I

The action of the device is obvious. Motion being communicated to theshaft J, it is communicated to the shaft K at a velocity depending onthe position of the rollers F and G.

Having thus described my invention, whatI Wish to claim by LettersPatent is In a variable-speed driving-gear, the combination, With thedisks D and E, of the longi tudinally-movable shaft N, the arms M M,pivoted on said shaft, the friction-rollers F and G, carried by saidarms, the rod 0, secured to one of said arms and passingthrough theother arm, the nut or head on said rod, and the coiled spring encirclingsaid rod, substantially as described. v

In testimony that I claim the foregoing as my own I have hereuntoaffixed my signature in presence of two witnesses.

CONRAD M. OONRADSON.

Witnesses:

WV. R. BAGLEY, D. O. WooDWARD.

